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Discrete data: Graphs and skewness

 I am studying an introductory course in statistic " Essentials of Statistics".
The author mentioned that Histograms are used to represent the frequency distribution of a contiuous data. Then directly, he explained how to detect if there is skewness in the data using histograms. Later he highlted some other types of plots and graphs including the bar chart.

What is missing for me, What are the graphs that represent a quantitive **discrete** data? 
If bar chart,  then is it possible to use bar chart to detect the   skewness in a quantitive discrete  data?